SteppedPower (version 0.3.4)

RandEff_to_alpha012: Correlation structure: transform random effects to alpha

Description

Correlation structure: transform random effects to alpha

Usage

RandEff_to_alpha012(sigResid, tau, gamma, psi)

Value

a list containing four named elements (possibly matrices): `alpha0`, `alpha1`, `alpha2` specify a correlation structure and SigMarg denotes the marginal standard deviation

Arguments

sigResid

Residual standard deviation on individual leve

tau

standard deviation of random cluster intercept

gamma

standard deviation of random time effect

psi

standard deviation of random subject specific intercept

Examples

RandEff_to_alpha012(sigResid=sqrt(11), tau=4, gamma=3, psi=2)

## The function is vectorised:
RandEff_to_alpha012(sigResid = matrix(c(0,1,2,3,4,5), 2, 3),
                    tau      = matrix(c(1,1,1,0,0,0), 2, 3),
                    gamma    = matrix(c(0,0,1,0,0,1), 2, 3),
                    psi      = matrix(c(0,1,1,0,0,1), 2, 3))